Saw-sharpening machine.



G. E. RHODES.

SAW SHARPENING MACHINE. APPLICATION FILED FEB. 13, 1914.

1 137 66 Patented Apr. 27, 1915.

2 $HEETSSHEET 'E1R hadea THE NORRIS PETERS 60., PHOTO-LITHOH WASHINGTON.Dv C G. E. RHODES. SAW SHARPENING MACHINE.

APPLICATION FILED FEB. 13, 1914.

1 9 1 3?,664 Patented Apr. 27, 1915.

2 SHEETS-SHEET 2.

GCERhades THE NORRIS PETERS C0. PHOTO-LITHO. WASH/NGTON, n. C.

iinirnn snares PATENT @FFTQFZ.

GEORGE E. RHODES, OF JACKSONVILLE, FLORIDA, ASSIGNOR OF ONE-HALF TOELBRIDGE L. RHODES, OF WHITEHOUSE, FLORIDA.

SAW-SHARPENING MACHINE.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed February 13, 1914. Serial No. 818,512.

To all whom it may concern:

Be it known that I, GEORGE E. RHODES, a citizen of the United States,residing at Jacksonville, in the county of Duval and State of Florida,have invented certain new and useful Improvements in Saw-SharpeningMachines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in saw sharpeningmachines and resides in the provision'of a device of the characterdescribed which will operate to file and sharpen the teeth of a saw in areliable and expeditious manner.

An important object of my invention is to provide a saw sharpeningmachine of the character described which will automatically feed the sawso that the different teeth thereof are moved into a position to beengaged by the filing or sharpening member, upon the rotation of a crankhandle.

Another important object of my invention is to provide a simple andinexpensive machine of the character described which will operate in areliable and expeditious manner to sharpen the teeth of a saw, saidoperation being automatic, requiring only the setting of the saw in aclamp and the turning of a crank handle.

Another important object of my invention is to provide means for movingthe saw after one of the teeth has been sharpened so that the next toothis in a position to be sharpened, said action being automaticallybrought about by the turning of a crank shaft.

A still further object of my invention is to provide a saw sharpeningmachine of the character described which is simple as to construction,reliable and eflicient in operation, not liable to derangement and cheapto manufacture.

The above and additional objects are accomplished by such means as areillustrated in the accompanying drawings, described in the followingspecification and then more particularly pointed out in the claim whichis appended hereto and forms a part of this application.

lVith reference to the drawings, wherein I have illustrated thepreferred embodiment of my invention as it is reduced to practice,

and throughout the several views of which similar reference numeralsdesignate corresponding parts: Figure 1 is a top plan view of my deviceshowing it as it would appear when in assembled position. Fig. 2 is aside elevation. Fig. 3 is a cross sectional view taken on line 33 ofFig. 1 and showing a saw in position relative to the machine, and Fig. 4is a sectional view taken on line 4-4 of Fig. 2 showing the arrangementfor moving the file out of engagement with the saw upon the returnmovement of the file which reciprocates.

Referring to the drawings by characters of reference the numeral 1designates a base board upon which is secured the base plate 2 of aframe designated 3 as an entirety. The frame 3 consists of a pluralityof vertical standards or posts 4 upon the upper ends of which aremounted spaced longitudinal bars 5 and 6. The bars 5 and 6 serve astracks for the sharpening mechanism to be later described.

The sharpening mechanism consists of an approximately rectangular slideplate 7 that is provided upon its under face with a longitudinal guideplate or bar 8. This guide plate or bar 8 is fitted between the bars 5and 6 in engagement with the inner longitudinal edges of the bars 5 and6. A transverse bar 9 is secured centrally of the ends of the bar 8 andhas its free ends disposed in overlapping engagement with relation tothe inner edges of the bars 5 and 6.

The bar 9 is secured by suitable fastening 10 turned upon the plate 8and serves to prevent accidental derangement of the slide plate 7 aswill be clearly seen with reference to Fig. 4 in the drawings. Anangular upstanding bearing 11 is secured adjacent to each end of theplate 7 and sup ports a shaft 12. The shaft 12 is arrangedlongitudinally with relation to the plate 7 in superposed relation toone longitudinal edge thereof and has secured thereon a pair of fileholding arms 13. The arms 13 are provided with apertures adjacent toeach end thereof. The apertures at one end receive the shaft 12. A setscrew 14 is provided at the inner ends of the arms 13 to provide for theangular disposal of the arms with relation to the plate 7 and shaft 12.The arms 13 are arranged adjacent to the ends of the shaft 12 andproject outwardly and downwardly therefrom. The outer or tripper arm 24.As the arm 24' is held lower ends of the arms 13 are enlarged andapertured as at 15 to receive the ends of a file 16. Set screws 17 areturned in the enlarged apertured portions 15 and adapted to engage theends of the file 16 to hold the file in secured position. The file 16serves as a sharpening element. The slide plate 7 Carrying the fileholding arms and file is adapted to be reciprocated upon the frame 3 sothat the file may engage and sharpen the teeth of a saw. I

As a means for reciprocating the plate 7, I provide a crank shaft 18having its ends journaled in a pair of upstanding bearings 19 that aremounted upon the bars '4 and 5. One end of the shaft 18 is extendedthrough one of the bearings 19 and has secured thereon a crank handle20. A connecting rod 21 is operatively connected at one end to the crankshaft 18 and pivoted adjacent but in spaced relation to the other endbetween the sides of an upstanding'bifurcated bearing 22. The bearing 22is carried upon the upper face of the plate 7 adjacent to one endthereof. The connecting rod 21 is extended beyond the pivot point andforms an extension 23 which is for a purpose to be later described. Itwill be readily seen that upon the turning of the crank handle 20 theplate 7 and parts thereon will be moved back and forth upon the bars 4and 5 of the frame 3. A trip arm 24 is secured at one end to theintermediate portion of the shaft 12 and extending outwardly from theshaft in a plane approximately parallel with the plate 7 normally, isdesigned to coiiperate with the extension 23 of the rod 21. A set screw25 is carried by the trip arm 24 and serves to permit adjustment of thearm relative to the shaft 12. The free end of the arm 24 extendsoutwardly over and beyond the extension 23 at a point spaced from theend of the extension. An arm 26 is secured at one terminal upon theshaft 12 at a point suitably spaced from the arm 24 and is adjustable bymeans of a set screw 26' after the same manner as the arm 24. Aplurality of openings 27 disposed in spaced relation to each other areformed in the arm 26. One end of a helical retractile spring 28 issecured within certain of the openings 27 and the other end suitablysecured as at 29 t0 the plate 7. The arm 26 is disposed in such a waythat the spring action holds the file 16 in an outward position relativeto the plate 7 so that the teeth of the saw may be engaged when theplate 7 is moved forwardly upon the frame 3. The plurality of openings27 provided enable the adjustment of the tension of the spring 28. Itwill be readily seen that upon the return movement of the plate after aforward movement the extension 23 trips the under face of the againstrotation upon the shaft 12 by means of the set screw 25, the shaft 12 isturned against the action of the spring 28 and so that the file 16 ismoved out of engagement with the teeth of the saw.

After the extension 23 is moved out of tripping engagement with thetripper arm.

24, the spring 28 serves to return the file 16 to a position whereby thefile will engage the teeth when the plate 7 is moved forwardly. Thereciprocation of the plate as will be readily observed is brought aboutby means 7, 1 provide an angular stop arm 30 that is secured to theshaft 12 after the same manner as the arms 24 and 26." The angularportion of the arm 30 is provided with a set screw 31. and is disposedto engage the adjacent bearing 11 upon the rear face or edge thereof.The set screw 31 may be turned so that the outward movement of the file16 is limited. The end of the set screw 31 engages the rear face or edgeof the adjacent standard 11 and as the arm 30 is secured againstrotation upon the shaft 12 the rotary movement of the shaft 12 islimited and the file is held against further outward movement. It willbe readily seen that the outward movement of the file may be regulatedby means of the screw 31 carried by the angular stopper arm 30.

As a means for holding the saw blade in the proper position so that thefile 16 will be moved into and out of engagement therewith, I provide aguide bar or plate 32'that is disposed vertically with relation to theframe 3 upon one side thereof and provided with a lateral extension 33through which suitable fastening means 34 is inserted for the purpose ofsecuring the plate 32 in the proper position relative to the frame 3.The upper end of this guide plate 32 is provided with a lateralextension 35 through which is pivoted as at 36 a clamping plate 37. Awing nut 38 turned upon the pivot pin for the pivoted clamping plate 37provides for the clamping of the saw blade between the extension 35 andplate 37. The extension 35 and plate 37 are disposed adjacent to thenormal position of the file 16 that is, in approximately the same planeas the normal position of the file. The saw blade is disposed with itsone face in engagement with the plate or bar 32 and extends between theextension 35 and plate 37 as clearly shown in Fig. 3 in the drawings.The saw blade is secured so that its adjustment is permitted relativeto' the extension 35 of the plate 37. It is preferable to dispose theclamping means for the saw blade in such a position that the full sweepor length of the file 16 will engage the tooth being sharpened. It willthus be seen that a saw blade when positioned as shown in Fig. 3 in thedrawings and the crank handle 20 rotated, the file will be moved intoengagement with one of the teeth on the saw blade upon the forwardmovement of the plate 7 and will be moved out of engagement or away fromthe saw blade when the plate 7 is returned to its normal position. Whenthe plate returns to its normal position after moving the file intoengagement with one of the teeth, the saw blade is fed or advanced insuch a way that the next lowest tooth in the blade is positioned to besharpened by the file 16.

As a means for feeding or moving the saw blade so that the teeth thereofare disposed for engagement with the file, I provide feeding mechanismwhich consists of a lifting or feeding pawl 39. This pawl 39 is pivotedupon the extension portion 40 of an operating arm 41. The operating arm41 is journaled intermediate its ends in a U- shaped bearing member 42and is formed angularly. The arm 41 is so formed that when moved backand forth the pawl 39 is moved into and out of engagement with the teethof the saw blade. The pawl 39 carries a right angular extension 43 thatis disposed at right angles to the saw blade when the saw blade is inthe proper position, outwardly from the pivot for the pawl 39. Theweight of the extension 43 serves to normally hold the pawl in aposition for engagement with the teeth of the saw blade. The arm 41 isprovided with a vertical portion .44 that is adapted to be oscillated tolift and lower the pawl 39 to bring about the feeding of the saw blade.

As a means for oscillating the vertical portion 44 of the arm 41 Iprovide a pair of connecting rods 45 and 46. The arm 46 carries at oneend a lateral apertured extension 47 which receives one end of the rod45. A set screw 48 is provided for the extension 47 and serves to securethe arms to each other in adjusted position. The arm 46 is connected atits outer end with eccentric mechanism of some suitable type designated49. This eccentric mechanism connects the arm 46 with the adjacent endof the crank shaft 18, that is, the end opposite to that which carriesthe crank handle 20.

An angular guard plate 17 is carried on the longitudinal edge of theplate 7 and adjacent to the file 16. This guard plate 17 serves to catchthe filings. A link 50 connects the rod 45 with the vertical portion 44of the arm 41. This link 50 is provided with an apertured portion whichreceives the vertical portion 44 of the arm 41 and is pivoted to theadjacent end of the rod 45. A set screw 51 is carried adjacent theapertured portion of the link 50 and serves to hold the link in adjustedsecured position upon the vertical portion 44 of the arm 41. l/Vhen thecrank shaft 18 is turned the arm 41 is oscillated through the medium ofthe connecting rods 45 and 46 and eccentric mechanism 49 which isconnected with one end of the shaft 18. The portion 40 of the arm 41 isdisposed at right angles to the arm and is lifted upwardly anddownwardly according to the movement of the arm 41. The extension 43carried by the pawl 39 serves to hold the pawl normally in a positionwhereby the pawl will engage the teeth. The extension 40 of the arm 41is disposed in a plane parallel to the longitudinal axis of the frame 3,while the pawl 39 is disposed at right angles to the extension 40 and ina position where it will readily engage the teeth of the saw blade asclearly shown in Fig. 3 of the drawings.

The rearward movement of the arm 41 with respect to the crank shaft 18lifts the pawl upwardly and advances the saw blade so that the nexttooth is in a position to be filed by the file 16. This action isprovided when the file 16 has been drawn to its normal or startingposition.

In operation, the saw blade is positioned after the manner describedwith relation to the device and when the shaft 18 is rotated the file ismoved into engagement with the tooth that is disposed for operation bythe file. When the plate 7 begins to return to its normal position, theeccentric mechanism 49 operates so that the arm 41 will be drawnrearwardly toward the crank shaft 18. hen this takes place the pawl 39forces the saw blade so that another tooth is positioned for filing. Thereturn movement of the plate 7 also causes the file to be moved out ofengagement or away from the saw blade after the manner described.

It will be noted with reference to the foregoing description andaccompanying drawings that I have provided a saw sharpening machinewhich will operate in a reliable and expeditious manner to sharpen theteeth of the saw and accomplish all the functions hereinbefore recited.

The device is a great labor saving one in that the saw is automaticallyfed so that the teeth are all sharpened without necessitating manualpositioning of the saw blade.

In reduction to practice, I have found that the form of my invention,illustrated in the drawings and referred to in the above description, asthe preferred embodiment, is the most efficient and practical; yetrealizing that the conditions concurrent with the adoption of my devicewill necessarily vary, I desire to emphasize the fact that various minorchanges in details of construction, proportion and arrangement of partsmay be resorted to, When required, Without sacrificing any of theadvantages of my invention, as defined in the appended claim.

What is claimed is A saW sharpening machine, comprising a support, asharpening element reciprocally mounted on said support, a saw holdingmeans carried by said support, means for holding saws therein, a crankshaft carried by said support, a connecting rod pivotally attached tosaid sharpening element and at its free terminal to said crankshaft,means for rotating said crankshaft thereon, an arm eccentrically mountedon one end of said shaft, an apertured extension mounted on one end ofsaid arm, a second rod placed through said aperture and firmly held by aset screw placed therein, said second 'rod being provided at its otherterminal With an adjustable link, said link connecting said arm to avertical shaft, a set screw carried by said link to hold the shaft in anadjusted position, said shaft having a pawl mounted on its lower end toadjust and regulate the position of thesaW teeth.

In testimony'whereof I affix my signature in presence of tWo Witnesses.

GEORGE E. RHODES. Vitnesses:

ALBERT W. HANNY, WV. W. DREATUR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. G. p a

